Contents of Volume 18 (1904–1905)

• B. WALKER. List of shells from northwestern Florida: 133–136
• B. WALKER. A new species of Medionidus: 136–137
• C. T. SIMPSON. A new locality for Cerion incanum: 137–138
• H. S. COLTON. Sexual dimorphism in Strombus pugilis Linne: 138–140
• T. H. ALDRICH. A new species of Somatogyrus from south Alabama: 140
• F. C. BAKER. New species of Lymnaea: 141–142
• C. H. CONNER. Glochidia of Unio on fishes: 142–143
• Notes: 143–144

• C. W. JOHNSON. Edward H. Ashmun: 121–122
• W. H. DALL. Some new species of mollusks from California: 123–125
• F. C. BAKER. Critical notes on the smaller lymnaeas: 125–127
• V. STERKI. A new species of Pisidium: 128–129
• O. BRYANT. Some notes on Bermudian mollusks: 129–131
• Notes: 131–132
• Publications received: 132

• J. B. HENDERSON, JR. Sensitiveness of certain snails to weather conditions: 109–110
• W. H. DALL. Note on Lucina (Miltha) childreni Gray and on a new species from the Gulf of California: 110–112
• C. W. JOHNSON. Further notes on the species of Martesia of the Eastern Coast of the United States: 112–113
• W. H. DALL. Notes on some preoccupied names of mollusks: 113
• T. D. A. COCKERELL. A new Oreohelix: 113–114
• W. H. DALL. Names in the Pupillidae: 114–116
• H. A. PILSBRY. The Pupillidae of Risso and Jeffreys: 116–120
• Notes and news: 120
• Publications received: 120

• G. WAGNER. On an interesting fossil Unio from Wisconsin: 97–100
• C. W. JOHNSON. On the species of Martesia of the eastern United States: 100–103
• T. D. A. COCKERELL. Note on the nomenclature of the snails usually called Pupa: 103–104
• H. A. PILSBRY. Notes on the nomenclature of Pupillidae: 105–107
• V. STERKI. New species of Pisidium: 108
• Publications received: 108

• G. H. CLAPP. New forms of Polygyra from Alabama: 85–86
• H. A. PILSBRY. New species of Buccinum from the Kuril Islands: 87–88
• C. B. MOORE. On the northernmost habitat of Liguus fasciatus on the Florida East Coast: 88–89
• H. A. PILSBRY. New land snails from North Carolina: 89–90
• T. D. A. COCKERELL. Agriolimax agrestis in Colorado: 90–91
• C. H. CONNER. Margaritana margaritifera in Pennsylvania: 91
• Notes and news: 91–92
• Publications received: 92–96

• C. W. JOHNSON. Panopea bitruncata Conrad: 73–75
• B. WALKER. Notes on eastern American Ancyli. III: 75–83
• Notes and news: 84

• T. H. ALDRICH. A new oyster from the Eocene of Alabama: 61
• F. C. BAKER. New American lymnaeas. II: 62–63
• S. N. RHOADS. A glimpse at the shell fauna of Delaware: 63–67
• Notes and news: 67–68
• Publications received: 68–72

• J. H. FERRISS. Southwestern shells: 49–54
• A. A. HINKLEY. List of Alabama shells collected in October and November, 1903 (continued): 54–57
• R. E. C. STEARNS. The Cambridge Natural History: errata corrected: 58
• H. A. PILSBRY. Plectopylis in the Riukiu Islands: 58–59
• H. A. PILSBRY. A new lower Californian Sonorella: 59
• General notes: 59–60

• A. A. HINKLEY. List of Alabama shells collected in October and November, 1903: 37–45
• D. BLANEY. The land-shells of Ironbound Island, Maine: 45–46
• C. W. JOHNSON. Notes on some Cape Cod Mollusca: 47–48

• B. WALKER. Notes on eastern American Ancyli. II (continued): 25–30
• G. H. CLAPP. A new Omphalina from Alabama: 30
• T. VAN HYNING. A molluscan stampede: 31–32
• H. A. PILSBRY and Y. HIRASE. Descriptions of new Japanese land snails: 32–34
• R. E. C. STEARNS. Limax maximus and other slugs in California: 34–36

• C. W. JOHNSON. On the generic position of Teredo fistula H. C. Lea: 13–14
• W. J. RAYOND. A new species of Pleurotoma from the Pliocene of California: 14–16
• B. WALKER. Notes on eastern American Ancyli. II: 16–17
• H. N. LOWE. A dredging trip to Santa Catalina Island: 18–20
• C. F. ANCEY. Notes on a few shells: 21–22
• Notes and news: 22–24
• Publications received: 24

• W. J. RAYMOND. Two new species of Pleurotoma from California: 1–3
• H. A. PILSBRY and Y. HIRASE. Description of new Japanese land shells: 3–9
• W. H. DALL. A singular Eocene Turbinella: 9–10
• F. C. BAKER. New varieties of American limnaeas: 10–12
• General notes: 12